Re: Performance of full outer join in 8.3

=?ISO-8859-1?Q?Christian_Schr=F6der?= <cs@deriva.de> writes:
> This is the query:
> select isin from ts_frontend.attachment_isins full OUTER JOIN
> ts_frontend.rec_isins using (attachment,isin)  WHERE attachment=2698120
> GROUP BY isin limit 1000;

Hmm.  It seems 8.3 is failing to push the attachment=2698120 condition
down to the input relations.  Not sure why.  All that code got massively
rewritten in 8.3, but I thought it still understood about pushing
equalities through a full join ...

            regards, tom lane